Planned changes to school uniform policy will affect over four million pupils across England, according to new estimates from the Department for Education (DfE).
The government says seven in 10 secondary schools and 35% of primary schools in England will have to reduce the number of compulsory branded items to three, plus a branded tie for secondary students.
The new rule is part of the Children's Wellbeing and Schools Bill, which still has several parliamentary stages to go through before becoming a law.
The government says families will save money, but school wear manufacturers warn the plans could end up costing them more.